Infrared Versus Visible Laser Photocoagulation in the Treatment of Specific Eye Diseases

In the visible and near infrared wavelength region melanin is the main absorbing chro-mophore of the fundus. As melanin absorption decreases with increasing wavelength (8), an increased penetration depth into the choroid can be expected for longer wavelengths (10,15,21), and is indicated by some experimental results (1,3,13,17), though quantification is still lacking.